/*
 * Copyright (c) 2025 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "cmcertmanagercheck_fuzzer.h"

#include <cstring>

#include "cert_manager.h"
#include "cert_manager_api.h"
#include "cert_manager_app_cert_process.h"
#include "cm_cert_data_user.h"
#include "cm_fuzz_test_common.h"
#include "cm_test_common.h"
#include "cm_cert_data_ecc.h"
#include "cm_cert_data_part1_rsa.h"
#include "cm_x509.h"
#include "cert_manager_check.h"

#define MAX_OUT_BLOB_SIZE (5 * 1024 * 1024)

namespace {
    const struct CmBlob g_eccAppCert = { sizeof(g_eccP256P12CertInfo), const_cast<uint8_t *>(g_eccP256P12CertInfo) };
    const struct CmBlob g_appCertPwd = { sizeof(g_certPwd), const_cast<uint8_t *>(g_certPwd) };
    const uint32_t  UINT32_COUNT = 4;
    const uint32_t  CM_BLOB_COUNT = 2;
    const uint32_t CHECK_UID_VALUE = 2;
}

using namespace CmFuzzTest;

namespace OHOS {
    struct BufferParams {
        uint8_t* myData;
        uint32_t* remainSize;
        uint32_t* offset;
    };

    struct StoreCertInfo {
        uint32_t store;
        uint32_t certNum;
        bool isCheckUid;
    };

    class BufferReader {
    public:
        static bool ReadUintFromBuffer(BufferParams& params, uint32_t* value)
        {
            return GetUintFromBuffer(params.myData, params.remainSize, params.offset, value);
        }

        static bool ReadStoreAndCertInfo(BufferParams& params, StoreCertInfo& info)
        {
            if (!ReadUintFromBuffer(params, &info.store)) {
                return false;
            }

            if (!ReadUintFromBuffer(params, &info.certNum)) {
                return false;
            }

            info.isCheckUid = info.store % CHECK_UID_VALUE;
            const uint32_t STORE_VALUE = 5;
            info.store %= STORE_VALUE;
            return true;
        }
    };

    class ServiceChecker {
    public:
        static void ExecuteServiceChecks(struct CmBlob* uri, uint32_t store, bool isCheckUid,
            struct CmAppCertParam* appCertParam, struct CmContext* cmContext)
        {
            (void)CheckUri(uri);
            (void)CmServiceGetSystemCertListCheck(store);
            (void)CmServiceGetSystemCertCheck(store, uri);
            (void)CmServiceSetCertStatusCheck(store, uri, store);
            (void)CmServiceInstallAppCertCheck(appCertParam, cmContext);
            (void)CmServiceGetUserCertInfoCheck(cmContext, uri, store, isCheckUid);
            (void)CmServiceUninstallAppCertCheck(cmContext, store, uri);
            (void)CmServiceGetAppCertListCheck(cmContext, store);
            (void)CmServiceGetCallingAppCertListCheck(cmContext, store);
            (void)CmServiceGetAppCertCheck(cmContext, store, uri);
            (void)CmServiceUninstallUserCertCheck(cmContext, uri);
            (void)CmServiceSetUserCertStatusCheck(cmContext, uri);
        }
    };

    static bool GenerateRandomUri(const char* retUriBuf, uint8_t* myData,
        uint32_t* remainSize, uint32_t* offset,
        struct CmBlob* randomUri)
    {
        char* random = nullptr;
        if (!GetDynamicStringFromBuffer(myData, remainSize, offset, &random)) {
            return false;
        }

        std::string randomString = std::string(retUriBuf) + random;
        size_t len = randomString.length();
        uint8_t* heapData = new uint8_t[len + 1];
        std::copy(randomString.c_str(), randomString.c_str() + len, heapData);
        heapData[len] = '\0';
        *randomUri = {len, heapData};
        delete[] random;
        return true;
    }

    bool DoSomethingInterestingWithMyAPI(const uint8_t* data, size_t size)
    {
        uint32_t minSize = sizeof(struct CmBlob) * CM_BLOB_COUNT +sizeof(uint32_t) * UINT32_COUNT;
        uint8_t *myData = nullptr;
        if (!CopyMyData(data, size, minSize, &myData)) {
            return false;
        }

        uint32_t remainSize = static_cast<uint32_t>(size);
        uint32_t offset = 0;
        char retUriBuf[MAX_OUT_BLOB_SIZE] = {0};
        struct CmBlob keyUri = {sizeof(retUriBuf), reinterpret_cast<uint8_t *>(retUriBuf) };
        uint8_t certAliasBuf[] = "PrivKeyA";
        struct CmBlob certAlias = { sizeof(certAliasBuf), certAliasBuf };
        struct CmBlob privKey = { 0, NULL };
        struct CmAppCertParam appCertParam = { (struct CmBlob *)&g_eccAppCert, (struct CmBlob *)&g_appCertPwd,
            &certAlias, CM_CREDENTIAL_STORE, INIT_INVALID_VALUE, CM_AUTH_STORAGE_LEVEL_EL2,
            FILE_P12, &privKey, DEFAULT_FORMAT };
        uint32_t uid = 20020156;
        uint32_t userId = 100;
        CmContext cmContext;
        cmContext.uid = uid;
        cmContext.userId = userId;
        if (CertManagerInitialize() != 0) {
            CmFree(myData);
            return false;
        }

        BufferParams bufferParams = {myData, &remainSize, &offset};
        StoreCertInfo storeInfo;
        if (!BufferReader::ReadStoreAndCertInfo(bufferParams, storeInfo)) {
            CmFree(myData);
            return false;
        }

        CmInstallAppCertPro(&cmContext, &appCertParam, &keyUri);
        struct CmAppUidList appUidList = { MAX_OUT_BLOB_SIZE + 1, nullptr };
        CmGetAuthorizedAppList(&keyUri, &appUidList);
        CertmanagerTest::MockHapToken mockHap;
        ServiceChecker::ExecuteServiceChecks(&keyUri, storeInfo.store, storeInfo.isCheckUid, &appCertParam, &cmContext);
        (void)CheckInstallMultiCertCount(&cmContext, storeInfo.certNum);
        struct CmBlob randomUri;
            if (!GenerateRandomUri(retUriBuf, myData, &remainSize, &offset, &randomUri)) {
                CmFree(myData);
                return false;
            }

        ServiceChecker::ExecuteServiceChecks(&randomUri, storeInfo.store,
            storeInfo.isCheckUid, &appCertParam, &cmContext);
        (void)CmUninstallAppCert(&keyUri, CM_CREDENTIAL_STORE);
        CmFree(myData);
        return true;
    }

    bool DoSomethingInterestingWithMyAPICmService(const uint8_t* data, size_t size)
    {
        uint32_t minSize = sizeof(struct CmBlob) * CM_BLOB_COUNT +sizeof(uint32_t) * UINT32_COUNT;
        uint8_t *myData = nullptr;
        if (!CopyMyData(data, size, minSize, &myData)) {
            return false;
        }

        uint32_t remainSize = static_cast<uint32_t>(size);
        uint32_t offset = 0;
        uint32_t userId = 100;
        CmContext cmContext;
        cmContext.userId = userId;
        if (CertManagerInitialize() != 0) {
            CmFree(myData);
            return false;
        }

        BufferParams bufferParams = {myData, &remainSize, &offset};
        uint32_t store;
        if (!BufferReader::ReadUintFromBuffer(bufferParams, &store)) {
            CmFree(myData);
            return false;
        }

        bool isCheckUid = store % CHECK_UID_VALUE;
        struct CmBlob userCertTest = { sizeof(g_certData01), const_cast<uint8_t *>(g_certData01) };
        std::string alias = "alias_user";
        char *aliasBuf = const_cast<char *>(alias.c_str());
        struct CmBlob certAliasTest = { alias.length() + 1, reinterpret_cast<uint8_t *>(aliasBuf) };
        CertmanagerTest::MockHapToken mockHap;
        (void)CmServiceInstallUserCertCheck(&cmContext, &userCertTest, &certAliasTest, userId, isCheckUid);
        (void)CmUninstallAppCert(&certAliasTest, CM_CREDENTIAL_STORE);
        CmFree(myData);
        return true;
    }
}

/* Fuzzer entry point */
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
{
    /* Run your code on data */
    OHOS::DoSomethingInterestingWithMyAPI(data, size);
    OHOS::DoSomethingInterestingWithMyAPICmService(data, size);
    return 0;
}